Specifications

87
Caveats for Cisco IOS Release 12.0
78-6455-12
Resolved Caveats—Cisco IOS Release 12.0(5)
• CSCdm21330
If you configure a maximum transmission unit (MTU) that is different from the serial interface
default value that is created using a channelized group on an E1 four-port controller, the following
error message is generated:
%DSX1-3-M32_MEM_ALLOC: Munich 32 channel memory allocation error
The serial interface is then put in an administrative shutdown state. There is no workaround.
AppleTalk
• CSCdm35802
When running test appletalk, the command-line interface (CLI) can hang during nbp lookup or
nbp confirm tests. This occurs when the user specifies network-visible entity (NVE) names with
null strings for the “object” or “type.” The commands in the following example cause the CLI to
hang, but allow other router functions to continue:
router# test apple
router(atalk test)# nbp lookup ?
LINE <object>:<type>@<zone>
router(atalk test)# nbp lookup :laserwriter@bpath
There is no workaround.
Basic System Services
• CSCdj93398
A Cisco router might display the following error message:
%SYS-3-MGDTIMER: Timer has parent, timer link, timer = 279DC -Process= "traffic_shape",
ipl= 6, pid= 41 -Traceback= 317DAEC 318353A 31B116
There is no workaround.
• CSCdk17135
Fast switching is not functional between 100Vg-AnyLAN and a PA-A1 port adapter. There is no
workaround.
• CSCdk48674
A Cisco 1600 series router is not able to receive Ethernet frames at wire speed. This causes the
Cisco 1600 series Ethernet driver to miss packets. The problem appears when a Windows 95 or
Windows NT machine joins more than 60 groups. The IGMP replies it sends are at wire speed, so
multicast groups are lost at the Cisco 1600 series router.
Workaround: Configure static multicast groups.
• CSCdk54265
When you upgrade a router to Cisco IOS Release 11.1(20)CC, there is a significant change in the
amount of time and CPU usage required to process network management requests. After the
upgrade, the CPU is utilized between 90 to 99 percent, and the process runs for over 1 hour.
The problem occurs when the demand poll (for example, HP OpenView [HPOV] or a NetMon
process) walks the routing table by way of Simple Network Management Protocol (SNMP). This
polling walks other things as well, such as Address Resolution Protocol (ARP) tables and interface
descriptor blocks (IDB). However, these take less than 10 seconds and have little affect on the
processor.